diff --git a/site-cookbooks/kosmos-ejabberd/recipes/default.rb b/site-cookbooks/kosmos-ejabberd/recipes/default.rb
index aabb097..0cde474 100644
--- a/site-cookbooks/kosmos-ejabberd/recipes/default.rb
+++ b/site-cookbooks/kosmos-ejabberd/recipes/default.rb
@@ -50,6 +50,28 @@ file "/opt/ejabberd/.erlang.cookie" do
   content ejabberd_credentials['erlang_cookie']
 end
 
+file "/opt/ejabberd/.hosts.erlang" do
+  mode "0644"
+  owner "ejabberd"
+  group "ejabberd"
+  content <<-EOF
+"andromeda.kosmos.org".
+"centaurus.kosmos.org".
+"draco.kosmos.org".
+  EOF
+end
+
+ruby_block "configure ERLANG_NODE" do
+  block do
+    file = Chef::Util::FileEdit.new("/opt/ejabberd/conf/ejabberdctl.cfg")
+    file.search_file_replace_line(
+      %r{#ERLANG_NODE=ejabberd@localhost},
+      "ERLAND_NODE=#{node['kosmos-ejabberd']['erlang_node']}"
+    )
+    file.write_file
+  end
+end
+
 postgresql_data_bag_item = data_bag_item('credentials', 'postgresql')
 
 hosts = [
@@ -203,6 +225,18 @@ unless node.chef_environment == "development"
     command  :allow
   end
 
+  firewall_rule 'ejabberd_cluster' do
+    port     [4369]
+    protocol :tcp
+    command  :allow
+  end
+
+  firewall_rule 'erlang_cluster' do
+    port     [4200..4210]
+    protocol :tcp
+    command  :allow
+  end
+
   firewall_rule 'ejabberd_stun_turn' do
     port     3478
     protocol :tcp